GCN Circulars
GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. See the documentation for help with subscribing to or submitting Circulars.
Search for Circulars by submitter, subject, or body text (e.g. 'Fermi GRB').
To navigate to a specific circular, enter the associated Circular ID (e.g. 'gcn123', 'Circular 123', or '123').
To navigate to a specific circular, enter the associated Circular ID (e.g. 'gcn123', 'Circular 123', or '123').
Advanced Search
To narrow the search results, use advanced search syntax. This allows for specifying which circular field to search (submitter, subject, and/or body). For additional information, refer to the advanced search documentation.
Advanced Search Examples (click to copy):
subject:"Swift"body:"GRB"submitter:"Judith Racusin"16 results found.
- GRB 070412: TAROT Calern observatory optical observations
- GRB 070412: Deep Keck imaging
- GRB 070412, deep LBT imaging
- GRB070412: Swift UVOT observations
- GRB 070412, Swift-BAT refined analysis
- GRB 070412 Liverpool Telescope optical limit
- GRB 070412: Swift-XRT refined analysis
- GRB 070412: further reanalysis of NOT images
- GRB 070412: Optical observations at Crni Vrh
- GRB 070412: Swift-XRT refined position
- GRB 070412: further NOT observations
- GRB 070412: Gemini/GMOS afterglow candidate
- GRB 070412: IAC80 optical afterglow candidate
- GRB 070412: NOT observations
- GRB 070412: Nearby bright galaxy
- GRB 070412: Swift detection of a burst